[PATCH] LLVMSymbolizer: Use alternative method if no inlining frames found.

[Will Dietz]

Fixes bug exposed by tsan lit tests where addresses fail to be
symbolized on my system (x86_64 linux).

An example of this failure can be seen with this binary[1]:

$ unxz ./thread_leak.3.c.tmp.xz

Using llvm-symbolizer from ToT:

$ echo ./thread_leak3.c.tmp 0x020560 | ~/llvm/build/bin/llvm-symbolizer
__interceptor_pthread_create
??:0:0

And after:

$ echo ./thread_leak3.c.tmp 0x020560|~/llvm/build/bin/llvm-symbolizer
__interceptor_pthread_create
/home/will/llvm/latest/projects/compiler-rt/lib/tsan/rtl/tsan_interceptors.cc:876:0

Proposed patch attached.

~Will

[1] http://wdtz.org/files/thread_leak3.c.tmp.xz
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